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REM sleep typically occupies 20â25% of total sleep in adult humans: about 90â120 minutes of a night's sleep. The first REM episode occurs about 70 minutes after falling asleep. Cycles of about 90 minutes each follow, with each cycle including a larger proportion of REM sleep.
Sleep: 16-18 hours a day are spent sleeping. Half is in REM sleep and the other is Deep sleep. REM sleep is when we dream. It is when the best sleep occurs and it is truly necessary to function. Auto-Stimulation Hypothesis - REM sleep is necessary Other states consist of Drowsiness, Quiet Alertness, and Crying.